Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sach ty » sach tu, sach thu, xach tay
nang ma » tang ma, sang ma, nang cao
qua cam » qua cham, qua cac, qua ca
xuc van » duc van, luc van, xuc ban
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) OR (sach y)) ((nang x) or (nang ma)) hoi. hieu qua cam xuc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) ((nang x) OR (nang ma)) hoi. hieu qua cam xuc van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach y)) ((nang x) or (nang ma)) hoi. hieu qua cam xuc van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach y)) ((nang x) or (nang ma)) hoi. hieu qua cam xuc van hanh vi cua tre*.